Low-pressure mercury vapour discharge lamp

Details Low-pressure mercury vapour discharge lamp Low-pressure mercury vapour discharge lamp

H - Electricity

01

J

313/81

H01J 61/44 (2006.01) C09K 11/77 (2006.01)

Patent

CA 1216883

-31- ABSTRACT : Low-pressure mercury vapour discharge lamp. A low-pressure mercury vapour discharge lamp having a very satisfactory colour rendition (R(a,8) ? 85) and having a colour temperature of at least 3200 K and a colour point located on or near the Planckian locus. The lamp is provided with a luminescent layer comprising : a. a luminescent alkaline earth metal halophosphate activated by Sb3+ or by Sb3+ and Mn2+ b. a luminescent material activated by Eu2+ and having an emission maximum at 470-500 nm and a half-width value of at most 90 nm and c. a luminescent rare earth metal metaborate acti- vated by Ce3+ and Mn2+ and having a fundamental lattice Ln(Mg,Zn,Cd)B5010, where Ln represents the elements Y, La and/or Gd, which borate has a red Mn2+ emission. Preferably, the luminescent layer comprises : d. a luminescent material activated by Tb3+ and having green Tb3+ emission. With these lamps, the phenomenon of disruption of metamery is completely or substantially completely avoided. Furthermore, the lamps have a high luminous flux and a high maintenance of the luminous flux during the life. Figure 9.

444073

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